ELK stack specs recomendations

Grettings, what will be your recomended specs for Logstash, Elastic and kibana machines based on the folowing:

I will consume about 1.000.000 documents daily
The size of those documents, daily, will be about 1.5 GB
3 virtual machines for the ELK stack will run on ESXi.
Probably a 3 docker nodes will be on the elastic machine

Thanks!